Electrode comparison

E308L vs E309L

E308L matches 304 base metal; E309L is over-alloyed so it survives dilution when welding stainless to carbon steel.

E308L vs E309L at a glance

	E308L	E309L
AWS specification	AWS A5.4/A5.4M	AWS A5.4/A5.4M
Process	Stick (SMAW)	Stick (SMAW)
Form	Covered electrode	Covered electrode
Tensile strength (min)	75 ksi	75 ksi
Yield strength (min)	45 ksi	45 ksi
Elongation (min)	35%	30%
Impact toughness	Not required; austenitic deposits stay tough to cryogenic temperatures	Not required by the specification
Polarity	DCEP, AC	DCEP, AC
Positions	Flat, Horizontal, Vertical, Overhead	Flat, Horizontal, Vertical, Overhead
Penetration	Shallow to medium	Shallow to medium
Deposition rate	Medium	Medium
Coating / core	Lime-titania (-16)	Lime-titania (-16)
Slag	Self-lifting, brittle, must be removed completely between passes	Self-lifting, must be fully removed between passes
Shielding gas	None — self-shielding	None — self-shielding
Storage	Keep dry. Stainless coatings pick up moisture and cause porosity and worm tracks.	Dry storage, rod oven after opening — same discipline as E308L.
Primary use	Food, dairy and beverage equipment	Joining austenitic stainless to carbon or low-alloy steel

Which should you use?

Chemistry decides this one. E308L is a nominal 19Cr-10Ni deposit that matches Type 304 base metal. E309L runs richer at 23Cr-12Ni, deliberately over-alloyed so that when carbon steel melts into the puddle and dilutes the deposit, enough chromium and nickel remain to hold a crack-resistant austenitic-ferritic structure. Use E308L on stainless-to-stainless joints and E309L whenever carbon steel is on one side or you are laying the first layer of an overlay.

Choose E308L when

Welding 304 or 304L to itself
Sanitary and food-grade stainless fabrication
Cost-sensitive stainless work where dilution is not an issue

Choose E309L when

Stainless to carbon or low-alloy steel
Buffer layers under a stainless overlay
Repairing steels of unknown composition

Amperage compared

Diameter	E308L	E309L
3/32 in (2.4 mm)	40–80 A	40–80 A
1/8 in (3.2 mm)	65–110 A	65–110 A
5/32 in (4.0 mm)	95–150 A	95–150 A
3/16 in (4.8 mm)	130–190 A	130–190 A

Ranges are typical starting points. Diameters listed for only one electrode are shown as — for the other.

E308L vs E309L — common questions

What happens if you use E308L on a stainless-to-carbon-steel joint?

Dilution from the carbon steel side drops the chromium and nickel content of the deposit into a martensitic range. The weld becomes hard and brittle and commonly cracks.

Can E309L be used on a 304-to-304 joint?

Yes, and it will make a sound corrosion-resistant weld. It simply costs more than E308L with no benefit on a matching joint.

Do both have the same amperage range?

Practically, yes. Both run 65–110 A on a 1/8 in rod, DCEP, and both need roughly 10–15% less current than a carbon steel rod of the same diameter.

Full specifications

E308L

AWS A5.4/A5.4M

E308L is the standard stick electrode for welding 304 and 304L stainless, with a low 0.04% maximum carbon that protects against intergranular corrosion.

E309L